Peanut butter - but from peanut butter powder like PBfit or PB2. 85% less fat than real peanut butter for same portion.
My wife (who does not need to lose weight) hates the taste and won't go near it. I don't mind the taste.
The other weight-loss benefit: you mix up a certain number of tablespoons of power with water and you have just one serving of peanut "butter" in front of you, vs. dipping a spoon in the jar and pretending each heaping spoon is really only one tablespoon...